theme(A collection of visual elements and sounds for your computer desktop or device User Interface. A theme determines the look of the various visual elements of your User Interface, such as windows, icons, fonts, and colors, and it can include sounds)
subject(A category used to organize objects in the Knowledge Base); topic(The subject of a dynamic data exchange (DDE) conversation between two applications)
Topics(A feature of the Bing News app that lets users choose specific news topics to appear in their news feed, allowing them to personalize the app with these choices)
